修改mybatis plus Generator模板生成字段注释枚举常量
本文基于最新的mybatis-plus 3.0.1版本源码修改，如果使用其它版本，处理方式也类似，主要是生成Entity的FreekMarker模板文件的修改。
源码下载：https://gitee.com/baomidou/mybatis-plus
目标：
表的字段定义如下：
`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}'
生成的实体中有如下内容：
/*
* name_type : 女孩
*/
private final static INTEGER NAME_TYPE_GIRL = 0;
/*
* name_type : 男孩
*/
private final static INTEGER NAME_TYPE_BOY = 1;
/*
* name_type : 其它
*/
private final static INTEGER NAME_TYPE_OTHER= 2;主要的模板代码如下：
<#-- 注释的枚举常量生成，例如字段内容为：`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}' -->
<#if field.comment!?length gt 0>
<#if field.comment?contains("{") && field.comment?contains("}") && field.comment?contains("；") && field.comment?contains("，") >
<#assign object_str = field.comment?substring(field.comment?index_of("{")+1, field.comment?index_of("}"))/>
<#list object_str?split("；") as comment_element>
<#assign firstName = comment_element?substring(0, comment_element?index_of("："))/>
<#assign lastName = comment_element?substring(comment_element?index_of("：")+1, comment_element?index_of("，"))/>
<#assign meanName = comment_element?keep_after("，")/>
<#assign fname = field.propertyName/>
/**
* ${field.propertyName}：${meanName}
*/
public final static ${field.propertyType} ${(field.name)?upper_case}_${firstName?upper_case} = ${lastName};
</#list>
</#if>
</#if>完整的entity.java.ftl的内容如下：
package ${package.Entity};
<#list table.importPackages as pkg>
import ${pkg};
</#list>
<#if swagger2>
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
</#if>
<#if entityLombokModel>
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
</#if>
/**
* <p>
* ${table.comment!}
* </p>
*
* @author ${author}
* @since ${date}
*/
<#if entityLombokModel>
@Data
<#if superEntityClass??>
@EqualsAndHashCode(callSuper = true)
<#else>
@EqualsAndHashCode(callSuper = false)
</#if>
@Accessors(chain = true)
</#if>
<#if table.convert>
@TableName("${table.name}")
</#if>
<#if swagger2>
@ApiModel(value="${entity}对象", description="${table.comment!}")
</#if>
<#if superEntityClass??>
public class ${entity} extends ${superEntityClass}<#if activeRecord><${entity}></#if> {
<#elseif activeRecord>
public class ${entity} extends Model<${entity}> {
<#else>
public class ${entity} implements Serializable {
</#if>
private static final long serialVersionUID = 1L;
<#-- ---------- BEGIN 字段循环遍历 ---------->
<#list table.fields as field>
<#if field.keyFlag>
<#assign keyPropertyName="${field.propertyName}"/>
</#if>
<#if field.comment!?length gt 0>
<#if swagger2>
@ApiModelProperty(value = "${field.comment}")
<#else>
/**
* ${field.comment}
*/
</#if>
</#if>
<#if field.keyFlag>
<#-- 主键 -->
<#if field.keyIdentityFlag>
@TableId(value = "${field.name}", type = IdType.AUTO)
<#elseif idType??>
@TableId(value = "${field.name}", type = IdType.${idType})
<#elseif field.convert>
@TableId("${field.name}")
</#if>
<#-- 普通字段 -->
<#elseif field.fill??>
<#-- ----- 存在字段填充设置 ----->
<#if field.convert>
@TableField(value = "${field.name}", fill = FieldFill.${field.fill})
<#else>
@TableField(fill = FieldFill.${field.fill})
</#if>
<#elseif field.convert>
@TableField("${field.name}")
</#if>
<#-- 乐观锁注解 -->
<#if (versionFieldName!"") == field.name>
@Version
</#if>
<#-- 逻辑删除注解 -->
<#if (logicDeleteFieldName!"") == field.name>
@TableLogic
</#if>
private ${field.propertyType} ${field.propertyName};
<#-- 注释的枚举常量生成，例如字段内容为：`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}' -->
<#if field.comment!?length gt 0>
<#if field.comment?contains("{") && field.comment?contains("}") && field.comment?contains("；") && field.comment?contains("，") >
<#assign object_str = field.comment?substring(field.comment?index_of("{")+1, field.comment?index_of("}"))/>
<#list object_str?split("；") as comment_element>
<#assign firstName = comment_element?substring(0, comment_element?index_of("："))/>
<#assign lastName = comment_element?substring(comment_element?index_of("：")+1, comment_element?index_of("，"))/>
<#assign meanName = comment_element?keep_after("，")/>
<#assign fname = field.propertyName/>
/**
* ${field.propertyName}：${meanName}
*/
public final static ${field.propertyType} ${(field.name)?upper_case}_${firstName?upper_case} = ${lastName};
</#list>
</#if>
</#if>
</#list>
<#------------ END 字段循环遍历 ---------->
<#if !entityLombokModel>
<#list table.fields as field>
<#if field.propertyType == "boolean">
<#assign getprefix="is"/>
<#else>
<#assign getprefix="get"/>
</#if>
public ${field.propertyType} ${getprefix}${field.capitalName}() {
return ${field.propertyName};
}
<#if entityBuilderModel>
public ${entity} set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
<#else>
public void set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
</#if>
this.${field.propertyName} = ${field.propertyName};
<#if entityBuilderModel>
return this;
</#if>
}
</#list>
</#if>
<#if entityColumnConstant>
<#list table.fields as field>
public static final String ${field.name?upper_case} = "${field.name}";
</#list>
</#if>
<#if activeRecord>
@Override
protected Serializable pkVal() {
<#if keyPropertyName??>
return this.${keyPropertyName};
<#else>
return null;
</#if>
}
</#if>
<#if !entityLombokModel>
@Override
public String toString() {
return "${entity}{" +
<#list table.fields as field>
<#if field_index==0>
"${field.propertyName}=" + ${field.propertyName} +
<#else>
", ${field.propertyName}=" + ${field.propertyName} +
</#if>
</#list>
"}";
}
</#if>
}